Both NVIDIA and AMD offer better performance in Direct3D 11 than in OpenGL 4.0. But in the case of AMD, it seems the OpenGL 4.0 driver has really poor performances compared to the D3D one. But I’m sure that AMD’s OpenGL team will improve OpenGL tessellation speed.

Fun fact: according to this test, the GTX 480 is around 80% faster than the HD 5870 in Direct3D 11 and is around… 190% faster in OpenGL 4.0.. Please let me know if you notice an error in my numbers… It’s just not possible!

I remember we’ve ran unigine tropics throught gDebugger to see what it does in OpenGL rendering mode. And the results were…… strange. Unigine was doing some very useless work, like binding textures with 0x0 or 1×1 size, switching vertex buffers one after another without rendering, changing render states, also without rendering. But that was one-two years ago. Perhaps now everything works better.
Can anyone check that? gDebugger is available as a free trial for 7 days. It’s just i’m not able to do that right now.